[Mp4-tech] Effect of losing only partition B or both partition A and B

[ashfiqua tahseen]

Hi,
  I am working on data partitioned H.264. If I have a lossy environemnt where:
  case1: Partition B of an I frame is lost.
  case2: Both partition A and B of an I frame are lost.
  What will be the PSNR value of that particular I frame? I found that for the first case the PSNR is very low (around 15 dB) and in the second case the PSNR is around 26dB. I am using frame copy error concealment and JM 13.1.
  Why does case 1 provide lower PSNR than case 2?
  Any suggestion will be highly appreciated.
  Thanking you,
  Ashfiqua
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